WhatsApp Click-to-Chat Links: The Complete Format and Tracking Guide

A click-to-chat link opens WhatsApp with your number already selected and, optionally, a message already typed. It works from a website, an email, a QR code on a poster, or an Instagram bio. No API, no approval, no WhatsApp Business account required — it works with any WhatsApp number.

It is the single highest-conversion WhatsApp feature most businesses are not using properly, mostly because of encoding mistakes that break the message.

The Exact Format

https://wa.me/<phone>?text=<url-encoded message>

The phone number must be in full international format with no plus sign, no spaces, no dashes, no parentheses, and no leading zeros.

Input	Correct link
+1 (555) 123-4567	https://wa.me/15551234567
+880 1712-345678	https://wa.me/8801712345678
+44 20 7946 0958	https://wa.me/442079460958
020 7946 0958 (UK local)	https://wa.me/442079460958

That last row is the one that catches people: drop the national trunk prefix (0 in the UK) and use the country code instead.

The text parameter is optional. When present it must be URL-encoded.

Encoding Is Where Links Break

This is the cause of nearly every “the message gets cut off” report.

Character	Encode as
space	%20
line break	%0A
&	%26
?	%3F
#	%23
+	%2B
%	%25

The ampersand is the dangerous one. In a URL, & starts a new parameter — so text=Hi, I want the tea & coffee bundle sends “Hi, I want the tea ” and drops the rest. It fails silently. Nothing in the link looks wrong.

A correctly encoded link with a multi-line message:

https://wa.me/15551234567?text=Hi%2C%20I%27d%20like%20to%20book%20a%20table.%0A%0ADate%3A%20%0APeople%3A%20

Which arrives in the message box as:

Hi, I'd like to book a table.

Date:
People:

Note the trailing labels with nothing after them. That is deliberate — it prompts the customer to fill in exactly the fields you need, and it converts far better than an empty box.

You can encode by hand, use encodeURIComponent() in a browser console, or use a generator. WAPlus includes a click-to-chat generator that handles the encoding and produces the link and a QR code together, which removes the whole class of error.

wa.me vs. api.whatsapp.com

Both work and do the same thing:

https://wa.me/15551234567?text=Hello
https://api.whatsapp.com/send?phone=15551234567&text=Hello

Use wa.me for anything a person sees or types — it is shorter, produces a denser QR code, and prints better. Use api.whatsapp.com/send if you have a legacy integration expecting it. There is no functional difference.

There is also https://wa.me/message/<code>, the short link WhatsApp Business generates for you. It is convenient but you cannot control the pre-filled text or vary it per placement, which rules out the tracking technique below.

Tracking Which Link a Lead Came From

WhatsApp gives you no referrer. A message arrives with a phone number and nothing else — no UTM parameters, no source, no campaign.

The workaround is simple and reliable: encode the source into the pre-filled message itself.

Placement	Pre-filled message
Website contact page	Hi! I have a question. [WEB]
Instagram bio	Hi! I found you on Instagram. [IG]
Printed flyer QR	Hi! I scanned the flyer. [FLY]
Email signature	Hi! Following up from your email. [EML]
Google Business profile	Hi! I found you on Google. [GBP]

The tag arrives in the first message. Search your chats for [IG] and you have your Instagram lead count, with no analytics tooling at all.

Two refinements worth making:

• Keep tags short and bracketed so they read as a reference rather than as noise, and are trivially searchable.
• Vary the whole sentence, not just the tag, so the message still sounds natural for that context. Someone scanning a flyer in your shop should not open a message that says “I found you on Google.”

If you also want click-side data, wrap the link in your own redirect with UTM parameters, then 302 to the wa.me URL. That gives you clicks in your analytics and conversations tagged in WhatsApp — the two halves of the funnel.

QR Codes

For anything physical — a shop counter, a flyer, a vehicle, a business card — encode the click-to-chat URL into a QR code.

Practical rules that actually matter:

• Keep the pre-filled message short. Longer URLs mean denser codes, which scan worse in poor light.
• Print at 2 cm minimum, larger for anything scanned from more than arm’s length.
• Test on a real phone, in the actual lighting, at the actual distance, before printing a thousand of them.
• Label it. A bare QR code gets ignored; “Scan to message us on WhatsApp” gets scanned.
• Leave the quiet zone. The white margin around the code is part of the code — designers crop it and the code stops working.

Where to Put Them

In rough order of return:

1. Website floating button. Persistent, on every page, thumb-reachable on mobile.
2. Instagram and Facebook bio. The only clickable link in most social profiles.
3. Google Business Profile. High-intent traffic that is already looking for you.
4. Email signature. Costs nothing and runs on every email you send.
5. Order confirmations. The moment a customer most wants a support channel.
6. Physical QR codes. Counter, packaging, receipts, vehicle.
7. Ad landing pages. A WhatsApp conversation converts better than a contact form for high-consideration purchases.

Common Mistakes

• Leaving the + in the number. wa.me/+15551234567 fails. Digits only.
• Leading zeros. wa.me/0442079460958 fails. Country code, then the national number without its trunk prefix.
• Unencoded ampersands. Silently truncates the message.
• A pre-filled message that is too long. Anything past a sentence or two reads as a form and gets deleted before sending.
• No pre-filled message at all. An empty box makes the customer compose from scratch, which is the highest-friction possible start.
• Not testing on iOS and Android. Behaviour when the app is not installed differs; both should land somewhere sensible.

A Two-Minute Setup

1. Write your number in E.164 with the plus and spaces removed.
2. Write a one-sentence pre-filled message ending in a source tag.
3. URL-encode it.
4. Assemble https://wa.me/<number>?text=<encoded>.
5. Open it on your own phone and confirm the message arrives intact.
6. Generate a QR code from the same URL for physical placements.

Step 5 is not optional. Encoding errors are invisible in the link and obvious in the message.